/*
 * Copyright 2011-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.sabayframework.mem;

/**
 * Interface of an object that generates monotonically increasing IDs.
 * */
public interface IdGenerator {
	/**
	 * Returns next ID. All generated IDs must be unique and next ID must be greater than
	 * any previously generated by this generator.
	 * */
	long getNextId();
	/**
	 * Generates N sequential IDs. Note that this call blocks other calls to the generator.
	 * @param n number of sequential IDs that should be generated.
	 * @return array of length n filled with generated IDs.
	 * */
	long[] getNextIds(int n);
	
}
